CN217401255U - Mechanical sealing device - Google Patents

Abstract

The utility model belongs to the technical field of the mechanical seal technique and specifically relates to a mechanical seal device is related to, its cover is established and in the pump shaft and with pump case fixed connection's quiet ring, the cover is located on the pump shaft and with pump shaft synchronous motion's elastic component and compress tightly the subassembly, elastic component includes spring holder and a plurality of pressure spring, it includes rotating ring and butt ring seat to compress tightly the subassembly, the rotating ring inlays and locates the one end of butt ring seat towards quiet ring, the one end that the butt ring seat was kept away from to the rotating ring is hugged closely with the terminal surface in opposite directions of quiet ring, the pressure spring is located between the lateral wall in opposite directions of spring holder and butt ring seat, the spring holder is fixed to be equipped with a plurality of guide posts towards one side of butt ring seat, a plurality of guide posts supply a plurality of spring cover to establish, the one end that the spring holder was kept away from to a plurality of guide posts is the interval setting with butt ring seat, the pressure spring has the trend that keeps the rotating ring to compress tightly on quiet ring. This application has and leads to the pressure spring compression in-process through the guide post, reduces the pressure spring compression process and takes place the effect of great range deflection probability of buckling.

Description

Mechanical sealing device

Technical Field

The application relates to the technical field of mechanical sealing, in particular to a mechanical sealing device.

Background

The mechanical seal is a component which is used in pump equipment and plays a role in dynamic sealing, so that liquid in the volute of the water pump is not easy to flow out of the water pump through the pump shaft. The existing mechanical seal generally comprises a moving ring assembly and a stationary ring assembly, wherein the moving ring assembly comprises a shaft sleeve connected with a pump shaft, a moving ring, a spring seat, a spring and a moving ring seat, the moving ring, the spring seat, the spring and the moving ring seat are sleeved on the shaft sleeve, the moving ring is arranged on the spring seat, the spring is arranged between the spring seat and the moving ring seat, and the moving ring seat is welded with the shaft sleeve.

At present, all set up a plurality of spring holes that are the interval setting on the terminal surface in opposite directions of spring holder and rotating ring seat, the spring hole supplies the spring to inlay and establishes, under the spring action of spring, has the trend of keeping away from each other between spring holder and the rotating ring seat, and the rotating ring on the rotating ring seat compresses tightly in the one end of quiet ring. In view of the above-mentioned related technologies, the inventor believes that axial movement between some pump casings and pump shafts is more frequent, and the diameter of the spring hole is often greater than the diameter of the spring, and when the spring works in an environment with excessive compression force for a long time, the spring is easy to deflect and bend in a large amplitude in the compression process, and the resilience force is reduced, so that a gap is formed between the static ring and the dynamic ring, the sealing effect is reduced, and improvement is needed.

SUMMERY OF THE UTILITY MODEL

In order to reduce the probability that the spring is deflected and bent to a larger extent in the compression process, the application provides a mechanical sealing device.

The application provides a mechanical seal device adopts following technical scheme:

a mechanical sealing device comprises a stationary ring, an elastic component and a pressing component, wherein the stationary ring is sleeved on a pump shaft and is fixedly connected with a pump shell, the elastic component is sleeved on the pump shaft and synchronously moves with the pump shaft, the elastic component comprises a spring seat (30) and a plurality of compression springs, the compression component comprises a movable ring and an abutting ring seat, the movable ring is embedded at one end of the abutting ring seat facing the static ring, one end of the movable ring far away from the abutting ring seat is clung to the opposite end surface of the static ring, the compression spring is arranged between the spring seat (30) and the opposite side wall of the abutting ring seat, spring holder (30) orientation one side of butt ring seat is fixed and is equipped with a plurality of guide posts, and is a plurality of the guide post supplies a plurality of the pressure spring cover is established, and is a plurality of the guide post is kept away from the one end of spring holder (30) with butt ring seat is the interval and sets up, the pressure spring has the maintenance the rotating ring compress tightly in trend on the quiet ring.

Through adopting above-mentioned technical scheme, the pressure spring is when the pressure shrink that receives the butt ring seat, under the direction and the limiting displacement of guide post, the axis direction shrink of guide post is followed to the pressure spring, and then the pressure spring is difficult for taking place to deflect and buckle in compression process, has increased the life of pressure spring simultaneously for keep good leakproofness between rotating ring and the quiet ring.

Optionally, at least one driving screw is arranged on a side wall of the spring seat (30) facing away from the abutting ring seat, and a screw rod of the at least one driving screw penetrates through the spring seat (30) and is in threaded connection with the abutting ring seat.

Through above-mentioned technical scheme, set up of drive screw makes difficult emergence relative break away from between spring holder and the butt ring seat, and is difficult for taking place relative rotation in the axis direction of pump shaft for the pressure spring is difficult for taking place relative friction with the terminal surface of butt ring seat towards the one end on the butt ring seat, keeps the butt stability of pressure spring and spring holder, butt ring seat.

Optionally, the spring holder (30) orientation has seted up the groove of stepping down on the lateral wall of butt ring seat, the groove of stepping down with the guide post is with the axle center setting, the groove of stepping down supplies the one end that the guide post is close inserts and slides.

Through adopting above-mentioned technical scheme, when the axial of following the pump shaft between butt ring seat and the spring holder is gone up and is scurried when the distance is great, the guide post inserts and steps down the inslot for be difficult for bumping between guide post and the butt ring seat and arouse wearing and tearing, improve the life of guide post.

Optionally, an inclined chamfer is formed on the end face, far away from the abutting ring seat, of the guide column.

Through adopting above-mentioned technical scheme, when the guide post inserted the inslot of stepping down, the setting of slope chamfer makes when the guide post with step down the notch in groove and appear the offset of minizone, slope chamfer butt on the notch inner wall in the groove of stepping down, the guide post inserts the inslot of stepping down.

It is optional, a plurality of all seted up the butt annular on the notch inside wall in groove of stepping down, the embedded butt gasket that is equipped with of butt annular, the butt gasket with close one end of pressure spring is supported tightly each other.

Through adopting above-mentioned technical scheme, the pressure spring supports tightly each other with the butt gasket when supporting to press on with the butt ring seat, has reduced the direct probability that produces wearing and tearing with the cyclic annular butt of pressure spring to reduce and connect the ring seat lateral wall and accelerate the probability of corrosion because of wearing and tearing, play the effect of the whole life of extension sealing device.

Optionally, a lubricating groove is formed in the inner wall of the yielding groove and used for storing lubricating oil.

Through adopting above-mentioned technical scheme, lubricating oil can be saved in the lubrication groove when instiling into the inslot that steps down to reduce the relative frictional force of the inslot wall that steps down between the guide post lateral wall, when making the guide post insert the inslot that steps down simultaneously, form the oil film between lubricating oil and the guide post, cushion when inserting the inslot that steps down to the guide post.

Optionally, the lubrication groove is spirally arranged along the axial direction of the abdicating groove.

Through adopting above-mentioned technical scheme, the lubrication groove is the heliciform setting and makes the guide post when the lubricating oil contact in the lubrication groove, can evenly paint on the guide post inserts the lateral wall of stepping down the inslot, and can save more lubricating oil.

Optionally, the spring holder (30) is fixed on the terminal surface towards the butt ring seat and is equipped with a slip section of thick bamboo, a slip section of thick bamboo with spring holder (30) are concentric setting, the inner wall of a slip section of thick bamboo is laminated with the outer wall of pump shaft mutually, the lateral wall of a slip section of thick bamboo supplies the butt ring seat cover is established and is slided, a slip section of thick bamboo with form the dashpot between the terminal surface in opposite directions of rotating ring.

Through adopting above-mentioned technical scheme, when butt ring seat slided and connects on a section of thick bamboo that slides, formed the dashpot between rotating ring and the section of thick bamboo that slides, when the relative velocity of motion is very fast between rotating ring and the section of thick bamboo that slides, formed the buffering atmospheric pressure in the dashpot, reduced the probability that bumps between a section of thick bamboo that slides and the rotating ring, played the guard action to the rotating ring.

Optionally, a first sealing groove is formed in the inner wall of the abutting ring seat, a first sealing ring is embedded in the first sealing groove, and the first sealing ring abuts against the outer side wall of the sliding barrel.

Through adopting above-mentioned technical scheme, first sealing ring has improved the sealed effect between butt ring seat and the section of thick bamboo lateral wall that slides for liquid is difficult for flowing out from the clearance between butt ring seat inner wall and the section of thick bamboo outer wall that slides.

Optionally, a second sealing groove is formed in the inner wall of the spring seat, a second sealing ring is embedded in the second sealing groove, and the second sealing ring abuts against the side wall of the pump shaft.

Through adopting above-mentioned technical scheme, the setting up of second sealing ring makes liquid be difficult for flowing out in the clearance between pump shaft and the spring holder inner wall, further increases sealing device's sealed effect.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the pressure spring is contracted under the pressure of the abutting ring seat, the pressure spring is contracted along the axis direction of the guide post under the guiding and limiting effects of the guide post, so that the pressure spring is not easy to deflect and bend in the compression process, and the service life of the pressure spring is prolonged;

2. the arrangement of the transmission screw enables the spring seat and the abutting ring seat not to be separated relatively easily, and relative rotation is not easy to occur in the axis direction of the pump shaft, so that one end of the pressure spring facing the abutting ring seat is not easy to rub against the end face of the abutting ring seat relatively, and the abutting stability of the pressure spring against the spring seat and the abutting ring seat is maintained;

3. lubricating oil can be saved in the lubrication groove when dripping into the inslot that steps down to reduce the relative frictional force of the inslot wall of stepping down between the guide post lateral wall, make the guide post insert when stepping down the inslot simultaneously, form the oil film between lubricating oil and the guide post, cushion when inserting the inslot that steps down to the guide post.

Drawings

Fig. 1 is a schematic view of the overall structure of a sealing device mounted on a pump shaft in the application.

Fig. 2 is an exploded view of the stationary ring and spring assembly, compression assembly, and drive screw of the present application.

Fig. 3 is an exploded view of the hold-down bolt and spring seat in this application.

Figure 4 is an exploded view of the abutment ring seat and abutment washer, spring seat, drive screw of the present application.

Fig. 5 is an enlarged view at a in fig. 4.

FIG. 6 is an axial side view of the abutment ring seat of the present application.

Fig. 7 is a half sectional view of a mechanical seal of the present application.

Description of the reference numerals: 1. a stationary ring; 10. a rubber ring; 2. a compression assembly; 20. a moving ring; 21. an abutting ring seat; 210. embedding a groove; 211. a screw hole; 212. a yielding groove; 213. abutting against the ring groove; 214. a lubrication groove; 215. a first seal groove; 22. abutting the gasket; 23. a first seal ring; 3. an elastic member; 30. a spring seat; 301. a countersunk hole; 302. a threaded hole; 303. perforating; 304. a sliding barrel; 305. a second seal groove; 31. a pressure spring; 32. a guide post; 320. inclining and chamfering; 33. a hold-down bolt; 34. a drive screw; 35. a second seal ring; 4. a buffer tank.

Detailed Description

The present application is described in further detail below with reference to figures 1-7. In this embodiment, the x-axis direction of the coordinate system in the figure is the left direction, and the direction opposite to the x-axis direction is the right direction.

The embodiment of the application discloses a mechanical sealing device. Referring to fig. 1 and 2, the mechanical sealing device includes a stationary ring 1, a compression assembly 2 and an elastic assembly 3, the stationary ring 1 is sleeved on the pump shaft and is relatively static with the pump shaft, the compression assembly 2 includes a movable ring 20 and a butt ring seat 21 which are sleeved on the pump shaft and move synchronously along with the pump shaft, the movable ring 20 is disposed on the butt ring seat 21 and the movable ring 20 abuts against the stationary ring 1 at one end in opposite directions, the elastic assembly 3 includes a spring seat 30 and a pressure spring 31, the spring seat 30 is sleeved on the pump shaft and is fixedly connected with the pump shaft, the pressure spring 31 is disposed on the spring seat 30 and is used for driving the movable ring 20 to compress on the stationary ring 1, a guide post 32 for the pressure spring 31 to be sleeved on the spring seat 30, the pressure spring 31 is compressed along the axial direction of the guide post 32 in the compression process, and is not prone to be bent greatly.

Referring to fig. 2, a rubber ring 10 is sleeved on a circumferential outer side wall of the stationary ring 1, the rubber ring 10 and the stationary ring 1 are vulcanized, bonded and fixed into a whole, and in this embodiment, the stationary ring 1 is made of a silicon carbide material. The rubber ring 10 is fixedly connected with the casing of the pump casing when being installed, and further the static ring 1 is fixed.

Referring to fig. 2, the left end face of the abutting ring seat 21 is provided with an embedding groove 210, the embedding groove 210 is communicated with the inner wall of the abutting ring seat 21, the embedding groove 210 and the abutting ring seat 21 are coaxially arranged, the embedding groove 210 is used for embedding the moving ring 20, and when the moving ring 20 is embedded in the embedding groove 210, the seat end face of the moving ring 20 protrudes out of the left end face of the abutting ring seat 21. When the installation is carried out, the movable ring 20 is pressed against the right end face of the fixed ring 1 under the action of the elastic force of the pressure spring 31.

Referring to fig. 2, the guide posts 32 are provided in plurality, the guide posts 32 are fixedly connected to the left end surface of the spring seat 30 near the edge, and the guide posts 32 are uniformly spaced along the axial direction of the spring seat 30. During installation, one end of the pressure spring 31 abuts against the left end face of the spring seat 30, the other end of the pressure spring 31 abuts against the right end face of the abutting ring seat 21, and the other end of the pressure spring 31 is pressed against the right end face of the abutting ring seat 21 to extrude the abutting ring seat 21 towards the left side through adjusting the relative distance between the spring seat 30 and the abutting ring seat 21, so that the movable ring 20 is pressed against the stationary ring 1.

Referring to fig. 3, at least one countersunk hole 301 is formed in the side wall of the peripheral side of the spring seat 30, a threaded hole 302 is formed in the bottom of the countersunk hole 301, the threaded hole 302 is communicated with the inner wall of the spring seat 30, a compression bolt 33 is connected to the threaded hole 302 in an internal thread manner, and a screw of the compression bolt 33 is compressed on the side wall of the pump shaft, so that the spring seat 30 and the pump shaft are not prone to relative rotation. In the present embodiment, three compression bolts 33 are provided, and correspondingly, three threaded holes 302 and three counter bores 301 are opened, and the three threaded holes 302 are provided at intervals in the axial direction of the spring seat 30.

Referring to fig. 4, at least one driving screw 34 is disposed on the spring seat 30, at least one through hole 303 is disposed on a right end surface of the spring seat 30, screw holes 211 coaxially disposed with the through holes 303 are disposed on a right end surface of the abutting ring seat 21 in a one-to-one correspondence manner, and a screw of the driving screw 34 is threaded into the corresponding screw hole 211 after passing through the through hole 303. In the present embodiment, the number of the driving screws 34 is described as three, three corresponding through holes 303 are provided, and the three through holes 303 are uniformly provided along the axial direction of the abutment ring seat 21.

Referring to fig. 4 and 5, in order to prevent the guide posts 32 from colliding and rubbing against the abutment ring seat 21 when circumferential movement occurs between the abutment ring seat 21 and the spring seat 30, a plurality of relief grooves 212 are formed in the right end surface of the abutment ring seat 21, and the plurality of relief grooves 212 are used for inserting and slidably connecting the corresponding plurality of guide posts 32.

Referring to fig. 3, in order to enable the guide post 32 to be inserted into the avoiding groove 212 when a slight deviation exists between the notch of the avoiding groove 212 and the guide post 32 in the process of inserting the guide post 32 into the avoiding groove 212, an inclined chamfer 320 is formed on the left end surface of the guide post 32, when the guide post 32 is inserted into the avoiding groove 212, the inclined surface of the inclined chamfer 320 abuts against the sidewall of the notch of the avoiding groove 212, and the guide post 32 and the avoiding groove 212 are automatically aligned and corrected under the guiding action of the inclined surface.

Referring to fig. 2 and 4-5, in order to make the pressure spring 31 abut and press against the end surface of the abutting ring seat 21, the pressure spring 31 is not easy to rub against the right end surface of the abutting ring seat 21, abutting ring grooves 213 are formed in the inner side walls of the notches of the plurality of receding grooves 212, and abutting gaskets 22 for abutting and pressing the left end of the pressure spring 31 are embedded in the abutting ring grooves 213.

Referring to fig. 4 and 5, in order to buffer the guide post 32 when the guide post 32 is inserted into and slides on the inner wall of the abdicating groove 212, a lubrication groove 214 is formed on the inner wall of the abdicating groove 212, lubricating oil is added into the lubrication groove 214, and when the guide post 32 is inserted into the abdicating groove 212, an oil film is formed between the lubrication groove 214 and the side wall of the guide post 32 to buffer the insertion of the guide post 32 into the abdicating groove 212.

Referring to fig. 4 and 6, in order to uniformly coat the side wall of the abdicating groove 212 into which the guide post 32 is inserted, the lubricating groove 214 is formed along the inner wall of the abdicating groove 212 in a spiral line shape, and may be formed in other shapes to perform the same function in other embodiments.

Referring to fig. 7, a sliding barrel 304 is fixedly connected to the left end face of the spring seat 30, the sliding barrel 304 and the spring seat 30 are concentrically arranged, the diameter of the sliding barrel 304 is smaller than that of the spring seat 30, the sliding barrel 304 is used for the abutting ring seat 21 to be sleeved and slide, the inner wall of the moving ring 20 is attached to the circumferential side wall of the pump shaft, when the left end face of the spring seat 30 and the right end face of the abutting ring seat 21 are arranged at intervals, a buffer groove 4 is formed between the left end face of the sliding barrel 304 and the right end face of the moving ring 20, and when the sliding barrel 304 and the moving ring 20 move in opposite directions, buffer air pressure is formed in the buffer groove 4 to block and buffer the opposite movement between the sliding barrel 304 and the moving ring 20.

Referring to fig. 7, a first sealing groove 215 is formed in an inner wall of the abutting ring seat 21, the first sealing groove 215 is formed in an inner wall of the abutting ring seat 21 close to the right end face, a first sealing ring 23 is embedded in the first sealing groove 215, and one side of the first sealing ring 23, which is far away from the first sealing groove 215, abuts against an outer side wall of the sliding barrel 304, so as to increase the sealing performance between the abutting ring seat 21 and the outer side wall of the sliding barrel 304.

Referring to fig. 7, a second sealing groove 305 is formed in the inner wall of the spring seat 30, a second sealing ring 35 is embedded in the second sealing groove 305, the second sealing ring 35 is embedded in the second sealing groove 305, and the side wall of the second sealing ring 35, which is far away from the bottom of the second sealing groove 305, abuts against the outer side wall of the pump shaft, so that the sealing effect between the pump shaft and the inner wall of the spring seat 30 is improved.

The implementation principle of the mechanical sealing device in the embodiment of the application is as follows: the static ring 1 is arranged on the pump shaft in a sleeved mode and is static relative to the pump shaft, the static ring 1 is fixedly connected with the pump shell, the movable ring 20 is pressed on the right end face of the static ring 1 under the pressure action of the pressure spring 31, the pressure spring 31 contracts along the axis direction of the guide post 32 under the guide action of the guide post 32, when the circumferential float between the abutting ring seat 21 and the spring seat 30 is large, the guide post 32 is inserted into the abdicating groove 212, the left end of the pressure spring 31 is pressed on the abutting gasket 22, and the pressure spring 31 is not prone to bending to a large extent in the compression process.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. A mechanical seal, characterized by: the pump comprises a stationary ring (1) which is sleeved on a pump shaft and fixedly connected with the pump shell, an elastic component (3) which is sleeved on the pump shaft and synchronously moves with the pump shaft, and a pressing component (2), wherein the elastic component (3) comprises a spring seat (30) and a plurality of pressure springs (31), the pressing component (2) comprises a movable ring (20) and a butting ring seat (21), the movable ring (20) is embedded at one end, facing the stationary ring (1), of the butting ring seat (21), one end, far away from the butting ring seat (21), of the movable ring (20) is tightly attached to the opposite end face of the stationary ring (1), the pressure springs (31) are arranged between the spring seat (30) and the opposite side walls of the butting ring seat (21), a plurality of guide columns (32) are fixedly arranged on one side, facing the butting ring seat (21), and a plurality of the guide columns (32) are used for sleeving the pressure springs (31), one end, far away from the spring seat (30), of each guide column (32) and the corresponding abutting ring seat (21) are arranged at intervals, and the pressure spring (31) has the tendency of keeping the movable ring (20) pressed on the fixed ring (1).

2. A mechanical seal according to claim 1, wherein: at least one transmission screw (34) is arranged on the side wall of one side, back to the abutting ring seat (21), of the spring seat (30), and a screw rod of the at least one transmission screw (34) penetrates through the spring seat (30) and then is in threaded connection with the abutting ring seat (21).

3. A mechanical seal according to claim 1, wherein: spring holder (30) orientation has seted up on the lateral wall of butt ring seat (21) and has stepped down groove (212), stepped down groove (212) with guide post (32) are with the axle center setting, stepped down groove (212) confession the one end that guide post (32) are close inserts and slides.

4. A mechanical seal according to claim 1, wherein: an inclined chamfer (320) is formed on the end face, away from the abutting ring seat (21), of the guide column (32).

5. A mechanical seal according to claim 3, wherein: it is a plurality of butt annular (213) have all been seted up on the notch inside wall of abdicating groove (212), the embedded butt gasket (22) that is equipped with in butt annular (213), butt gasket (22) with the close one end of pressure spring (31) is supported tightly each other.

6. A mechanical seal according to claim 3, wherein: a lubricating groove (214) is formed in the inner wall of the yielding groove (212), and the lubricating groove (214) is used for storing lubricating oil.

7. A mechanical seal according to claim 6, wherein: the lubricating groove (214) is spirally arranged along the axial direction of the avoiding groove (212).

8. A mechanical seal according to claim 1, wherein: spring holder (30) are fixed on the terminal surface towards butt ring seat (21) and are equipped with a slip section of thick bamboo (304), a slip section of thick bamboo (304) with spring holder (30) are concentric setting, the inner wall of a slip section of thick bamboo (304) is laminated with the outer wall of pump shaft mutually, the lateral wall of a slip section of thick bamboo (304) supplies butt ring seat (21) cover is established and is slided, a slip section of thick bamboo (304) with form dashpot (4) between the terminal surface in opposite directions of rotating ring (20).

9. A mechanical seal according to claim 8, wherein: the inner wall of the abutting ring seat (21) is provided with a first sealing groove (215), a first sealing ring (23) is embedded in the first sealing groove (215), and the first sealing ring (23) abuts against the outer side wall of the sliding barrel (304).

10. A mechanical seal according to claim 1, wherein: a second sealing groove (305) is formed in the inner wall of the spring seat (30), a second sealing ring (35) is embedded into the second sealing groove (305), and the second sealing ring (35) is abutted to the side wall of the pump shaft.

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